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NJD |
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NJD World Chat Champion
Joined: 11 Mar 2015 Karma :
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Posted: 21:57 - 30 Mar 2018 Post subject: Spongy rear pedal after bleeding. |
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Last Sunday I over tightened the rear caliper banjo bolt attempting to tighten it (spaz episode) and had to leave it three days (Monday, Tuesday, Wednesday) before I could get all the parts delivered to perform a rebuild (I'd took it apart on that Sunday to have a look and clean it up but was worse than expected: caliper seal was fudged). During that time the Banjo bolt (the thread, since the head had snapped off) was in the caliper and the hose had a bag over the end (to prevent moisture entering).
Yesterday -- Thursday -- I rebuilt the caliper and bled the brakes. I had to remove all the fluid with a tissue (there wasn't much left as was given I'd lost some the Sunday prior pushing the pistons out) to clean the resivour because it had dirt on the bottom that I didn't want to suck into the line. While bleeding the brakes it started to rain lightly and so I put a cover over the top of the bike to prevent rain from enterting the brake resviour (I mention this because I assume rain can contaminate fluid). Satisfied that the fluid was clear and bubble free I tightened everything up and left it to use today, Friday.
And as I found out today the rear pedal was spongy. The brake is there but it's soft and so I can only assume there's still some air in the lines. I'd say the pedals so soft that its dangerous to use (says the one who still rode it to and from work like a donkey).
The fluid I used to bleed the brakes was opened last Sunday and put back in the cupboard, with a lid on, and used on Thursday. Is brake fluid really redundant after three days? I ask because I want to eliminate this as a cause. The fluid did had small air bubbles in when looking into the bottle but I've read people recommending six months before throwing a bottle away and so just want to eliminate this. Ie: if I bleed them again is this fluid ok to use or do I use the new bottle I've just purchased.
I used copper washers from Wemoto on the Banjo put think I'll probably replace them for ones I've got from Halfrauds (in a set) since they formed a better seal (why I didn't use them in the first place I'll never know).
The brake line has been on the bike since I've got it but I don't suspect it to be at fault as has the bleed nipple on the caliper.
My guess is I didn't bleed it for long enough but want to clarify on the fluid issue and gain a second opinion before I go any further.
____________________ The do it all, T̶h̶e̶ ̶b̶r̶o̶k̶e̶n̶ ̶o̶n̶e̶,̶ ̶T̶h̶e̶ ̶b̶i̶g̶ ̶l̶u̶m̶p̶,̶ ̶C̶h̶o̶n̶g̶ ̶N̶o̶o̶d̶l̶e̶ |
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Shaft |
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Shaft World Chat Champion
Joined: 27 Dec 2010 Karma :
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Posted: 22:38 - 30 Mar 2018 Post subject: |
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It's not your fluid, look for another cause. ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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Hong Kong Phooey |
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Hong Kong Phooey World Chat Champion
Joined: 30 Apr 2016 Karma :
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NJD |
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NJD World Chat Champion
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Beehive Bedlam |
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Beehive Bedlam World Chat Champion
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NJD |
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NJD World Chat Champion
Joined: 11 Mar 2015 Karma :
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Posted: 13:10 - 01 Apr 2018 Post subject: |
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Done, I think.
Used the method: "press pedal several times and hold, open bleed valve and watch fluid rush out for a moment or two, close bleed valve and release pedal." Pedal felt solid after not very long.
Went for a quick ride and the pedal seemed fine although I think the bike could do with a longer run or some constant use to wake it up a little. Probably developed "play too much attention to something after a fault occurs" syndrome, though, so will see what the commutes to work bring.
Everything -- beside the clips that attach onto the hose going from the M/C to behind the real pedal bracket (they're rusty) -- is in good shape. If further fault occurs there's either an air leak somewhere or it could be as simple as road crud accumulating behind the pedal bracket.
Here's hoping to end of it. ____________________ The do it all, T̶h̶e̶ ̶b̶r̶o̶k̶e̶n̶ ̶o̶n̶e̶,̶ ̶T̶h̶e̶ ̶b̶i̶g̶ ̶l̶u̶m̶p̶,̶ ̶C̶h̶o̶n̶g̶ ̶N̶o̶o̶d̶l̶e̶ |
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Beehive Bedlam |
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Beehive Bedlam World Chat Champion
Joined: 28 Oct 2013 Karma :
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Posted: 14:01 - 01 Apr 2018 Post subject: |
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NJD wrote: | Done, I think.
Used the method: "press pedal several times and hold, open bleed valve and watch fluid rush out for a moment or two, close bleed valve and release pedal." Pedal felt solid after not very long.
Went for a quick ride and the pedal seemed fine although I think the bike could do with a longer run or some constant use to wake it up a little. Probably developed "play too much attention to something after a fault occurs" syndrome, though, so will see what the commutes to work bring.
Everything -- beside the clips that attach onto the hose going from the M/C to behind the real pedal bracket (they're rusty) -- is in good shape. If further fault occurs there's either an air leak somewhere or it could be as simple as road crud accumulating behind the pedal bracket.
Here's hoping to end of it. |
Ok. |
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Howling Terror |
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Howling Terror Super Spammer
Joined: 05 Dec 2008 Karma :
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Posted: 14:07 - 01 Apr 2018 Post subject: |
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...and to push those last few micro bubbles out tie the lever down. Depending on bike you may be able to use a piece of wood to brace against the frame or anchor the lever down. Fiddly but will push the bubbles out. ____________________ Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
The Harry Turner Project |
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tom_e |
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tom_e Brolly Dolly
Joined: 27 Feb 2016 Karma :
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fireyphoenix1... |
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fireyphoenix1... Brolly Dolly
Joined: 31 Dec 2010 Karma :
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NJD |
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NJD World Chat Champion
Joined: 11 Mar 2015 Karma :
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Posted: 18:01 - 01 Apr 2018 Post subject: |
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Things they don't teach you while learning to ride a motorbike tip 101: physical books do have a use, after all (try doing this with your kindle, huh).
Hopefully remains in place until tomorrow morning (several hours is better than non, right?).
https://s7.postimg.org/w932flge3/R1_DX.jpg
https://s7.postimg.org/uiomra3i3/R1_D.jpg ____________________ The do it all, T̶h̶e̶ ̶b̶r̶o̶k̶e̶n̶ ̶o̶n̶e̶,̶ ̶T̶h̶e̶ ̶b̶i̶g̶ ̶l̶u̶m̶p̶,̶ ̶C̶h̶o̶n̶g̶ ̶N̶o̶o̶d̶l̶e̶ |
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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kgm |
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kgm World Chat Champion
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MCN |
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MCN Super Spammer
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kgm |
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kgm World Chat Champion
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kramdra |
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kramdra World Chat Champion
Joined: 28 Oct 2010 Karma :
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Posted: 20:40 - 11 Apr 2018 Post subject: |
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Or incompetence. Read the opening post again. If you follow a process and fill/ bleed in a specific order, you can have it done perfectly in about 5-15 minutes, repeatable every time. |
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NJD |
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NJD World Chat Champion
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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Posted: 22:32 - 11 Apr 2018 Post subject: |
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kramdra wrote: |
Or incompetence. Read the opening post again. If you follow a process and fill/ bleed in a specific order, you can have it done perfectly in about 5-15 minutes, repeatable every time. |
I hope you are not being an arse.
And you are just trying to explain something incompetently. ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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Old Thread Alert!
The last post was made 5 years, 352 days ago. Instead of replying here, would creating a new thread be more useful? |
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